Move thumbnails file location to {$upload_path}/thumbnails or {$upload_path}/sites/{$blog_id}/thumbnails for multisite.
More Plugins
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Your Simple Slider
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BusinessPress
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Weer
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Supervisor
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Unsortable Meta Box
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Disables unnecessary functionality
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My Upload Images
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Bible Reading Plans
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Orbisius Support Tickets
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oEmbed Plus
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CFS Custom Category Fields
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Simple Quick Tags
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Outdated Plugin Notifier
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SilkyPress Input Field Block
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last.fm Live!
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Sidobe WP Notification
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Payment Gateway for MyAmeriaPay
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Pk Google Analytics
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ThemeCanvas Locations for Elementor with OpenStreetMap
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Slightly troublesome permalink